O-Ring Cord

The O-Ring cord differs from classic O-ring seals because, unlike ORs which are supplied molded as closed rings, it is supplied directly as a cord/filament, in rolls or skeins of various lengths. It is in fact sold by the meter, in rolls or skeins of the required length.

Ideal for custom seals in industrial machines, for linear gaskets, or in any type of sealing that requires an OR cord of a specific length.

Choose the exact length you need, without waste. Get the O-Ring cord by the meter or in whole rolls: cut, glue and solve non-standard sealing problems in the workshop, without waiting for custom supplies.

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Available Materials for O-Ring Cord

Choose the right material to resist oil, extreme temperatures or chemical agents. Here are our main options:

• NBR (nitrile anti-oil rubber): Perfect for oily and hydraulic environments, resists daily wear well.
• FKM (Viton): Ideal for high temperatures and aggressive chemicals, used in chemical and aerospace industries.
• VMQ 60 (silicone): Excellent for temperatures from -60°C to +200°C, flexible and available in Food-Grade version for food contact, i.e. suitable for food contact and use in pharmaceutical productions.
• EPDM: Resistant to ozone, UV and vapors, common in outdoor and hot water applications.
• CR* (neoprene) self-extinguishing on request: Fireproof and anti-oil, for critical applications with safety standards.
• Natural rubber*: Economical and elastic, for general low-cost uses.
• SBR*: Robust and anti-abrasion, perfect for humid or heavy mechanical environments.

How to Choose the Right O-Ring Cord?

Choose based on your real problem: environment, temperature, pressure or fluids. We guide you with practical examples for mechanical industries, hydraulics, food and chemical sectors.

• Oil, fuels and hydraulics: NBR (black nitrile rubber, tough) — resists daily wear, from -30°C to +100°C.
• Aggressive chemistry, acids or high temperatures: FKM (Viton) — top choice for +200°C and solvents, lasts years in pumps and valves.
• Water, steam, ozone or UV: EPDM — elastic outdoors, from -50°C to +150°C, common in HVAC and irrigation.
• High temperatures or food/pharma: VMQ (silicone) — flexible from -60°C to +200°C, food-grade version in red or white.
• Fire safety: CR (neoprene) self-extinguishing — for fireproof standards in machinery.
• Economical general uses: Natural rubber or SBR — anti-abrasion for conveyor belts and humid environments.

Contact us for special O-Ring Cord requests with custom hardness (in Shore A) or custom diameter — we solve your procurement needs as quickly as possible.

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Available Hardnesses for O-Ring Cord

The hardness of the compound (indicated in Shore A) affects both the flexibility and the sealing performance of the O-Ring cord: lower for soft seals, higher for high pressure.

Our production range allows us to supply O-Ring cord on request in various hardnesses, from 20 to 80 Shore A. In addition, our large warehouse provides immediate availability for immediate delivery of OR cord in hardness 55/65 Shore A.

• 20* Shore A: Very soft, for irregular joints.
• 30* Shore A: High elasticity, ideal for vibrations.
• 40* Shore A: Good for light general uses.
• 45-50* Shore A: Balanced, resists medium compression well.
• 55-60-65 Shore A (standard): The most requested, versatile for the majority of industrial applications, available in stock for immediate delivery.
• 70-75* Shore A: Hard, for high pressures and loads.
• 80* Shore A: Maximum rigidity, for extreme environments.

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Available Diameters for O-Ring Cord

We cover a wide range for every need, from small seals to large shafts. We produce custom O-Ring cord with diameters from 1 mm to 120 mm.

In addition, in our large industrial products warehouse, you can find immediate stock availability:

• From 1.5 mm to 33 mm diameter in NBR: Ready to use, the most common for quick maintenance.
• From 1.55 mm to 20 mm diameter in VITON FKM: Ready to use, the most resistant for special and heavy-duty applications.
• From 1.5 mm to 20 mm diameter in SILICONE VMQ: Ready to use, resistant to high temperatures and available in Food Grade version for contact with food and sanitary/pharmaceutical products.
• On request we can produce O-Ring Cord from 1 mm diameter up to 120 mm: Made to order for special projects and minimum quantities.

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O-Ring Cord Dimensions Table – Available Diameters and Weight per Meter

Diameter Section (mm)	NBR (g/m)	FKM Viton (g/m)	VMQ Silicone (g/m)
1	–	–	1*
1,5	2*	–	2
1,55	2	3	–
1,6	2	4*	2*
1,78	3	4	3
1,8	–	–	3*
2	4	6	4*
2,4	–	–	5
2,5	6	9	6
2,62	6	10	6
2,7	7	10	–
3	8	13	8
3,2	10	14	–
3,5	–	–	11
3,53	12	18	–
3,6	12*	18	–
4	15	23	14
4,5	19	29	18*
5	24	35	23
5,3	–	–	25
5,34	27	40	–
5,5	28	43*	27*
5,7	31	46	29*
6	34	51	32
6,35	–	–	36*
6,4	39	58*	–
6,5	40*	60	38
6,9	–		43
7	46	69	44
7,5	53*	79	51*
8	60	90	58
8,2	–	–	61*
8,4	66*	99*	64*
8,5	68*	102*	65*
9	76	114	73
9,5	85	127	81*
10	94	141	90
10,5	104*	155*	–
11	114	171	109
11,5	–	–	119*
12	135	203	130*
12,5	147*	220*	141*
13	159*	–	152
14	184	–	176
15	212	317*	203
16	241*	–	230
17	272*	–	260*
18	305	457*	292*
19	339	509*	325
20	376	564	360
22	455*	682*	436*
23	–	–	476*
24	541*	812*	518*
25	588*	881*	563*
25,4	606*	910*	–
26	–	–	608*
27	685	–	–
28	737*	–	706*
30	846	1269*	810*
33	1024	–	–
40	1504*	–	–
50	2350*	–	–

All products are available for immediate delivery from stock, for immediate shipping, except products marked with *, which we produce on request.

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Competitive Advantages of O-Ring Cords

Adopting O-Ring cords instead of standard molded OR seals is a strategic choice for companies that need flexibility, logistics efficiency and speed of intervention. Compared to standard molded seals, this solution offers distinctive advantages:

1. Maximum Reactivity and Customization

Unlike traditional seals, which require waiting times linked to the creation of custom molds, O-Ring cord allows immediate on-site production. It is enough to cut the material to size and join it, drastically eliminating lead-times for non-standard sizes.

2. Warehouse and Logistics Optimization

For retailers and service centers, switching from pre-formed seals to cord by the meter means a drastic reduction in stock. A single warehouse reference (the reel) allows you to meet infinite dimensional requests, turning a fixed cost into a dynamic “on-demand” sales opportunity.

3. Efficiency in Maintenance and Retrofitting

In urgent maintenance contexts or on outdated machinery (where original spare parts may be out of production), O-Ring cord is the solution tool. It allows you to restore sealing in record time, minimizing machine downtime and related operating costs.

4. Cost Reduction on Small Batches

For prototyping or small series, investing in a dedicated mold is often uneconomical. O-Ring cord offers an unbeatable cost-benefit ratio, eliminating fixed tooling costs and guaranteeing a competitive unit price even for single pieces.

5. Gluing and Joining the Cord

Join with cyanoacrylate glue: clean, apply, press for 24 hours. Ideal for assembling toroidal gaskets made on the spot. It holds like a molded O-ring and resists vibrations. For permanent joints, use specific kits — no risk of leaks.

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Common Applications of O-Ring Cords

Used where quick and adaptable seals are needed:

• Hydraulics and pneumatics: seals on cylinders, pumps, valves — cut for on-site repairs.
• Industrial machines: flanges, tanks, conveyor belts in textile or packaging.
• Automotive and maintenance: seals on engines, transmissions for workshops.
• Heating and HVAC: seals on boilers, compressors.
• Food and pharma: EPDM or Silicone for hygienic tubes, without contamination.

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O-Ring Cord in food-grade silicone (VMQ)

In our warehouse we also have special O-Ring cord in VMQ silicone for food contact. Safe and certified, it is the Food Grade version suitable for contact with food and sanitary/pharmaceutical products:

• Cord diameter: From 1.5 mm to 50 mm.
• Standard color: Red (RED) for easy recognition in production plants.
• Other options: Also available in semi-transparent white; We can produce custom RAL colors on request and in quantities.
• Suitable for: Direct contact with food and sanitary/pharmaceutical products, compliant with the highest quality standards of DIN, ISO and European hygiene regulations.

Perfect for food and pharma machines — quick to use, cut to size by the meter.

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Quality Control: Defects We Avoid in Our O-Ring Cord

We produce O-Ring cord to high standards (ISO 3601-3, DIN 3771), checking every batch to avoid problems in use. Here are the most common defects we monitor — with maximum tolerated limits for standard diameters (e.g. from 1.8 to 7 mm):

• Misalignment or irregular shape: Max displacement 0.08-0.18 mm — seal remains centered.
• Burr or flash: Max height 0.1-0.18 mm — no sharp edges.
• Excessive shrinkage: Max depth 0.18-0.7 mm — uniform section, no voids.
• Excessive flash: Max 0.08-0.13 mm — smooth surface.
• Superficial folds: Non-radial, max 0.05 x diameter — elastic without cracks.
• Cuts or missing material: Max 0.6-1.7 mm — full sealing.
• Foreign bodies: Max 0.08-0.13 mm — clean inside and out.

Our cord passes all tests — zero returns for quality. For critical applications, ask us for extra checks.

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O-Ring Cord FAQ

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